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crypto: cts - Weed out non-CBC algorithms

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The cts algorithm as currently implemented assumes the underlying
is a CBC-mode algorithm.  So this patch adds a check for that to
eliminate bogus combinations of cts with non-CBC modes.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-01-16 19:38:17 +11:00
parent 3eda71676b
commit 988dc01744
1 changed files with 3 additions and 0 deletions
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3
crypto/cts.c
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@ -290,6 +290,9 @@ static struct crypto_instance *crypto_cts_alloc(struct rtattr **tb)
if (!is_power_of_2(alg->cra_blocksize)) if (!is_power_of_2(alg->cra_blocksize))
goto out_put_alg; goto out_put_alg;
if (strncmp(alg->cra_name, "cbc(", 4))
goto out_put_alg;
inst = crypto_alloc_instance("cts", alg); inst = crypto_alloc_instance("cts", alg);
if (IS_ERR(inst)) if (IS_ERR(inst))
goto out_put_alg; goto out_put_alg;